1 cup of baking soda in grams — 220 g.

Why 220 g per cup

Baking soda's density of 220 g/cup is essentially meaningless to bakers — you'll never measure a cup of it. The relevant unit is the teaspoon: 1 tsp ≈ 4.6 g.

Leaveners — baking soda, baking powder, yeast — are used in such small quantities (rarely more than 2 tsp per recipe) that precise weighing is overkill for most home bakers. The cup figure listed here is useful only for sanity-checking; you should never need to measure these by the cup.

The most accurate way to measure baking soda

For recipes where the outcome matters — bakes, doughs, anything leavened — measure baking soda on a kitchen scale set to grams. Set the bowl on the scale, press tare to zero, then add until the readout matches the gram value the recipe calls for. This removes the largest source of cup-to-cup variation: how you scoop.

The cup-based numbers on this page assume the “spoon and level” method — fluffing the ingredient in its container, spooning it into the cup, and levelling the top with a straight edge. Scooping directly with the cup packs more in, and can push the gram value up by 20-30 % for fluffy ingredients like flour and cocoa.